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Fin sanding
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KevinDo



Joined: 02 Jul 2012
Posts: 408
Location: Cabrillo Inside

PostPosted: Wed Apr 17, 2013 8:34 pm    Post subject: Reply with quote

spennie wrote:
All right now everyone, think hard: HOW did you learn these theories? Seriously, who told you? A very good windsurfer, perhaps a pro? A shop owner? A fin maker? That guy who dulls his fins to protect his feet from cuts? The guy who cuts out his own freestyle fins, who rarely sails over 15 mph?

Sorry to get so snarky, but the endless unsubstatiated claims on this forum get to me after a while. I don't claim to be the all-knowing guru of all things windsurfer, that's ISOBARS, but I've done a lot of personal testing and experimenting over the last 23 years of sailing, and I know what actually works and what is basically wives' tales.

However, since I'm NOT infallible, I sat down with someone who could give me some serious scientific input on this subject, Dr Clint Harper. I have the good fortune to work at Moorpark College here in SoCal, where Dr. Harper is the chair of the Physics dept., and a sailboat owner (that's his latest boat in the picture).

I sat down with Dr. Harper today, and discussed the various aspects of this discussion. The short version is: Sand your hull if you want to, keep your fins smooth. Some of the stuff in this thread is accurate, but mostly it's just stuff somebody heard from someone they consider believable. I sometimes do that, but this is one subject I'm very mental about, as I sail mostly slalom, and love to speed sail (went 40 mph. a couple times). Sanding your hull is scientifically proven to work at sailboat speeds, but my feeling is how much will you gain, 1/2 mph? I'm not on the World Cup tour, so would rather have the extra epoxy on there.

Sanding your fin could cause the laminar flow to detach, which leads to spinout.

If you wish to dispute my assertions, please refer to the photograph, and make sure your source of infomation has a PhD (or better) in physics, and owns their own sailboat.


Sooo...don't sand the board and the fins correct?
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spennie



Joined: 13 Oct 1995
Posts: 809
Location: Thousand Oaks, CA

PostPosted: Wed Apr 17, 2013 8:37 pm    Post subject: Reply with quote

KevinDo: It's in there - Sand your board if you want to, but not your fins.
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Spennie the Wind Junkie
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U2U2U2



Joined: 06 Jul 2001
Posts: 3056
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Wed Apr 17, 2013 9:05 pm    Post subject: Reply with quote

some of the replys on this thread are fricking hilarious

1% this 5% that... what Journal/ Scientific Study are your making quotes from ?


Some think that shark skin being rough is the way to go, let me know which fin feels like that

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windward1



Joined: 18 Jun 2000
Posts: 659

PostPosted: Wed Apr 17, 2013 10:14 pm    Post subject: :) Reply with quote

Now let's see......do I want my board and/or fin to have shark skin or dolphin skin. H'mmmmm....which is faster a dolphin or a shark?
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U2U2U2



Joined: 06 Jul 2001
Posts: 3056
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Thu Apr 18, 2013 8:09 am    Post subject: Reply with quote

Most dolphins are faster than the average shark. However some sharks are much faster. The blue shark is a very fast shark with speed bursts recorded over 40 mph. And the fastest shark the short finned mako shark is the fastest, with speeds spurting over 60 mph.

more than 1 answer :

While some sources claim that both dolphins and sharks can swim at speeds of over 60 mph, these reports are few and far between. Most experts agree that the top speed of some shark species is about 30mph, while dolphins most dolphins can only get up to 20mph.


as seen ::

No scientific research actually shows that dolphins are faster then sharks for one reason. They can swim about 24 miles an hour next to a boat for ten to thirty minutes which a shark could only swim for a short amount of time to catch it's food. It's like a speed boost. So dolphins are faster then sharks!

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spennie



Joined: 13 Oct 1995
Posts: 809
Location: Thousand Oaks, CA

PostPosted: Thu Apr 18, 2013 10:30 am    Post subject: Reply with quote

Let's see, dolphins are smart, and sharks are badass, so if you combine them you'll be like me, a smartass!
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windward1



Joined: 18 Jun 2000
Posts: 659

PostPosted: Thu Apr 18, 2013 11:03 am    Post subject: Reply with quote

But how smooth is your skin, Spennie?
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spennie



Joined: 13 Oct 1995
Posts: 809
Location: Thousand Oaks, CA

PostPosted: Thu Apr 18, 2013 11:33 am    Post subject: Reply with quote

Like a baby's behind, but I don't swing that way, sorry.
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windward1



Joined: 18 Jun 2000
Posts: 659

PostPosted: Thu Apr 18, 2013 12:31 pm    Post subject: Reply with quote

Me neither. Just trying to find out how slick a smartass you were . 'Laughing'
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U2U2U2



Joined: 06 Jul 2001
Posts: 3056
Location: Shipsterns Bluff, Tasmania. Colorado

PostPosted: Thu Apr 18, 2013 1:55 pm    Post subject: Reply with quote

update if you Professors come to a satisfactory consensus of opinion. I just finished packing the Van for a month on Hatteras, I need a beer..or 3

figure out how to become more minimalist.....in sails boards fins

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